Reinforcing-bar for concrete structures.



PATENTED MAY 28, 1907.

' No. 855,204. C

. -E. M. SCCEIELE.

REINFOROING BAR ECE CONCRETE STRUCTURES APPLIOATION FILED FEB. 5, 1901. v

. I 3 T a r E. A Q K 'UNITE EDSON M. SCOFIELD, OF PHILADELPHIA, PENNSYLVANIA;

REINFORCI NG-BAR FOR CONCRETE STRUCTURES.

- Specification of Letters Patent.

Patented May 28, 1907.

Application filed February 5, 1907. Serial No. 355,820

To all whom it warty concern: Be it'known that I, EDsoN M. SGOFIELD, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Reinforcing-Bars for Concrete Stri'ictures, of whichthe following is a specification.

One object of my invention is to provide a reinforcing bar for use in concrete structures,

which may be easily rolled with uniform re sults, and for which the rolls are readily con' structed by the use of tools available in all roll shops; the bar being of such conforma tion that the maintenance and repair of the 1 rolls for making it will involve a minimum of expense.

Another object of my inventioi s t provide a reinforcing bar of such cross section that it can be readily bent in one directionto form loops or other shapes for connecting it to other bars; and which is at the same time provided with transverse projections particularly designed to make it possible to wire different arrangements of bars together with- 2 5 out the possibility of their slipping or becoming displaced while concrete is being placed around them.

A further object of my invention is to provide a bar which shall be especially flexible go in one direction, so that it will act as a unit with the concreteinatrix in which it is cast, and which is nevertheless rounded on all edges, so as to be free from sharp corners from which cracks may start. It is also de- 3 5 sired that the bar shall have projections essentially normal to thedirection of the working stress, and of sufficient area to transfer such stress to the bar without sacrificing the objects enumerated above.

Another object of my invention is to provide a bar having the abovecharacteristics which shall nevertheless be essentially oval in cross section, and so permit the placing of more steel in a given width of beam than can be done with bars of other cross section.

These objects are attained as hereinafter set forth, reference being had to the accompanying drawings, in which:

Figure 1, is a perspective view illustrating the preferred form of my reinforcing bar;

Fig. 2, is a plan of the bar illustrated in Fig. 1 Fig.3, is a side elevation of the bar illustrated in Fig. 1 Fig. 4, is a vertical section of the bar taken on the line 44, Fig. 2; Figs.

.55 5 and 6, arevertical sections taken respectively on the lines 5-5 and 66, Fig. 4; Figs. 7 and 8, are plan views illustrating modified forms of my reinforcing bar; Fig.

9, is a perspective view illustrating a special form of the bar illustrated in Fig. 1; Fig. 10, is a section of a girder illustrating my method of arranging thin bars in a form.

In the above drawings, A represents the body of a reinforcing bar which, as shown in Fig. 5, has an elliptical cross section. EX- tending transversely across the opposite sides of the bar are two series of ribs a and agit being noted that these are substantially triangular in cross section and preferably ta-, pered from the center of-eaoh side of the bar in both directions to the edges thereof. More; over, as shown in Fig. 4, the ribs (1 on one side of the bar are preferebly formed substantially midway between the ribs a on the opposite side.

Between each pair of adjacent ribs a a are placed substantially conical projections a there being in the case illustrated in Figs. 1- to 6, inclusive, two of these projections between each pair of ribs, placed on opposite 8o sides of a central plane of the bar. The projections are preferably approximately onethird of the distance between ribs from each other and from the adjacent ribs.

From Fig. 2 it will be noted that the projections are so arranged that a line joining the two of them on one face or side of the body of the bar is substantially at right angles to the line adjoining the two nearest proections on the opposite face of the bar, so it will be seen that between the transverse planes passing through a pair of adjacent ribs a are five sets of projecting portions lying in approximatelycqui-distant parallel planes, of which the middle plane includes a rib a and the four remaining planes each include a conical projection a respectively on opposite sides of the bar. If desired, I may construct my bar as illustrated in Figs. 7 and 8, that is to say, with a single conical projection a on the same side of the bar as and midway between the two ribs (1, said projection being also in the plane including the rib a, on the opposite side of the bar. r

In Fig. 8 I have illustrated my bar as provided with a single conical projection a on each side of the bar between the two planes including the ribs a and a.

For'oertain purposes it may be advisable no to employ a bar such as is illustrated in Fig. i

9, the same being formed .with a series of transverse ribs, each of which consists of two portions (1. displaced so that they lie in two.

With a bar of the construction above noted, it will be seen that while its section is such as to permit of its being readily bent into various shapes, such as are required under conditions of use, it may none the less be set on edge in the bottom ofgirdersin such manner as to permit of the introduction of a greater amount of steel to a iven number of irders than would be poss' le or allowable with other forms of bars. Moreover, the arrangement and form of thej ribs and'projections are such that there is no'tende'ncy for the bar to split the concrete girder in which it is embedded, since it will be noted that the ribs present relatively flat surfaces to resist the tensile strain occurring in the line of the bar. Again, the various arrangements of ribs and projections prevent the shifting of the wires or spacers employed to tie together a number of bars, so that after said wires have once been put in place, there is no possibility of their becoming displaced so as to permit the slipping of the reinforcing bars out of position. By reason also of the oval section of the bar its end may be readily bent into loops for connection to other bars, while the provision of the tapering transverse ribs and in termediate projections provides an ideal construction for attaching vertical or diagonal tie members, both for tying into a body of concrete and for reinforcfiig'abeam or'girder. It is further to be-noted that the barabove described is of such construction tliat the cost of making and maintaining rolls is reduced to a minimum; theiribs requirin for their formation merely cuts in the rol s such as can be easily made with a milling tool and the conical projections requiring for their formation holes which can easily be made with an ordinary tapered drill.

By reason of the formation of the ribs and projections, and of the disposition of them along the bar, the stretch of the barin rolling is made practically uniform, and 1t 1s easy to ssaaea roll it uniformly and results.

ll claim 1. A reinforcing bar with certainty. of good of substantiallyelliptical section, having a series of transverse ribs on each. side, staggered relatively to each' other, with a, substantially conical projection, between each air of adjacent trans verse ribs, substantia ly as described.

2. A reinforcing bar of substantially elliptical section, having a series of transverse tions arranged in-lines inc ined to the aXis of the bar, and placed between each pair. of transverse iibs, substantially as described.

IlbS on each side, with a lurality of projec' 3. A reinforcing bar of substantially ellipv l V tical section, having a series of transverse ribs, on'each side, each rib being divided into I two parts staggeredrelatively to each-other and extending in planes substantially at right angles to the longitudinal'axis of the bar, substantially as described 4. A reinforcing'bar of substantially elliptical section, having a series of transverse ribs on each side, each rib beingdividedinto two parts staggered relatively to each-other, with a pluralit-y'of projections. arranged in lines inclined to the axis of the bar, and placed between each air of adjacent transverse ribs, substantial y as described.

5. A reinforcing bar of substantially elliptical section, having a series of transverse ribs on each side, with a pluralit'yof projections arranged in lines inclined to the -axis of the bar, and placed between each pair .of transverse ribs, each rib consisting of two substantially parallel sections having an intermediate section extending substantially at right angles to and uniting them,substantially as described' p 6. A reinforcing bar of substantially el liptical section, having a series of transverse ribs on each side, each rib consisting of portions'lyi ng in substantially parallel planes transverse to the longitudinal axis of the bar, with an intermediateportion extending substantially parallel to said longitudinal axis,

name to this specification, in the presence of two subscribing witnesses.

'EDSON M. scormLn.

Witnesses PRESTON KNIGHT, ROBT. S. GLEMoNs. 

